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No. 625,2I2. Patented May I6, I899.

S. STBAKER.

PULVEBIZING 0R GRINDING MACHINE.

(Application filed Dec. 29, 1897.)

4 Sheets-Sheet I.

(No Model.)

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N0. 625,2l2. Patented Nay l6, I899. S. STRAKEB.

PULVERIZING 0R GRINDING MACHINE.

(Application filed Dec. 29, 1897.)

4 Sheets-Sheet 2.

(No Model.)

liar/1 51/ THE Nonms PETERS cc. PHOTD-LITHOW WASHINGTON. n. c

Patented May I6, I899.

4 Shasta-Sheet 3.

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No. 625,2I2.

s. STBAKER.

PULVEBIZING UR GRINDING MACHINE.

(Application filed Dec. 29, 1897.)

(No Model.)

No. 625,2!2. Patented May [6, I899.

S. STRAKER. PULVERIZING 0B GRINDING MACHINE.

(Applicat ion fllsd m 29, 1997. v(No Model.)

4 Sheets-She0t 4.

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UNITED STATES PATENT OFFICE.

SIDNEY STRAKER, OF LONDON, ENGLAND, ASSIGNOR TO THE CENTRAL CYCLONECOMPANY, LIMITED, OF SAME PLACE.

PULVERIZING OR GRINDING MACHINE.

SPECIFICATION formingpart of Letters Patent No. 625,212, dated May 16,1899.

Application filed December 29, 1897. Serial No. 664,272. (No model.)

To all whom it may concern.-

Be it known that I, SIDNEY STRAKER, civil engineer, a subject of theQueen of Great vents in Great Britain, No. 9,995, dated May 18, 1893; inItaly, LXVII, 70, dated May 27, 1893; in Transvaal, No. 1,102, datedAugust 11, 1806; in Tasmania, No. 1,601, dated April 25, 1890, and inIndia, No. 208, dated June 15, 1806,) of which the following is aspecification, reference being had to theaccompanying drawings.

This invention relates to apparatus for pulverizing, grinding, ordisintegrating grain and other substances.

The chief object of my said invention is to provide an improvedpulverizing-disintegrator for the purpose of reducing heavy material.

Further objects of my invention are to improve the driving mechanism andcertain details of such apparatus.

In order that my said invention may be clearly understood, I willdescribe the same with reference to the accompanying drawings, in which-Figure 1 is a plan of a machine constructed according to myinvention, inwhich the grist is pulverized to an impalpable condition and thenejected through the top of the machine. Fig. 2 is a vertical section onthe line at as of Fig. 1. Fig. 3 is aview of the machine half inelevation and half in transverse vertical section at right angles toFig. 2 and on the line y y of Fig. 2. Fig. 4 is a detail of the machine.Fig. 5 is an exterior elevation of the machine, with the addition ofapparatus hereinafter fully described and constituting an importantadjunct to the said machine. Fig. 6 is a view at right angles to Fig. 5of the apparatus illustrated in the latter figure.- Figs. 7 and 8 areelevations at right angles to each other and partly in section of onearrangement of driving mechanism according to this invention.

Referring to Figs. 1, 2, and 3, A is the reducing-chamber, formed withina rectangular casing and a suitable hollow bed B, which supports thesaid casing.

C is the beater-shaft, upon which are secured a fan or beater D and apulley E, by which rotation is imparted thereto.

A is a channel .or chute by which the material to be disintegrated isintroduced into the reducing-chamber. Upon the inside of themachine-walls two serrated impinging rings J are bolted in parallelvertical planes, between which rings the fan D revolves. The serratedfaces of the said rings are inclined, so as to be nearer the fan D attheir outer circumference than at theirinner circumference, as shown inFig. 2. Each of said rings may be built up of bars or of separateserrated plates or may be made in one piece or in four or more segments.

Impinging bars K K are arranged in a double series placed in the upperportion of the reducing-chamber, the lower portion being closed bycorrugated impinging surfaces P P. Further, arelief-chamberB is formedin the casing 13. Material disintegrated in this machine is ejectedbetween the bars K K, as hereinafter set forth.

The bars K fit in recesses J, provided at the edges of the impingingserrated side ratchets J, and are fixed in the said recesses bysegmental plates Q, bolted to the side walls of the casing, as shown,and bearing upon the tops of the bars. the said segmental plates for thereception of the ends of bars K.

The bars K and K are arranged to form two concentric series. The bars ofeach series break joint with the bars of the other series.

Holes Q are formed in The corrugated impinging surfaces P are sup portedat their lower ends upon a bearingpiece R, forming part of the mainframe of the machine, and their upper ends are held in position by thescrews S, screwed through the casing. By slacking back the screws S theimpinging segments .P may be readily removed from the machine.

The relief-chamber B, which, as aforesaid, is provided upon one of thewalls of the'casing B, is open at its upper end, and at its lower endcommunicates with the interior of the reducing-chamber within theperiphery of the grinding-fan by openings B The lower walls B of therelief-chamber are inclined 0r hoppered to cause material which fallsthereon to return readily into the reducing-cham- ICO ber A bygravitation and by the action of the air-current. The said relief orreturn grist chamber B is provided to convey all particles ofinsufficiently-ground material back into the reducing-chamber A, whereit is further reduced until of a sufficiently fine consistency to becarried away by an exhauster into the grist depositing room.

A, Fig. 2, is the feed-channel by which material for reduction.is firstintroduced to the reducing-chamber A.

In some cases a continuous feed may supplement the hand-feed. Such acontinuous feed is illustrated in Fig. 4, wherein A is a hopper with abottom A which can reciprocate. C is an eccentric fixed upon acounter-shaft C and connected to the hopper-bottom A which itreciprocates as the shaft 0 rotates.

The apparatus illustrated in Figs. 5v and 6 constitutes a pneumaticseparator which is fitted with a manhole and clamping device andcomprises a hood or closed chamber T, connected at its lower end, asshown, with the upper portion of the casing of a machine of the typeshown in Figs. 1, 2, and 3, and connected at its upper end by the bentchannel T with the suction-inlet of a centrifugal fan U. Thedelivery-pipe U of the fan is connected to any suitablecollecting-chamber. Within the said hood are baffies T, T T and Tarranged as shown, for a purpose hereinafter explained. The baffles Tand T are arranged so as to act upon the current of I pulverizedmaterial which issues from the machine through the bars K K, Fig. 2, forexample, to cause the heavier and insufficiently-ground particles totravel on to the sloping wall T of the hood, down which they gravitateinto the grist-return chamber B, Fig. 2, for example, and thence intothe reducing-chamber of the machine for further reduction. All fine dustis separated from these heavier particles and carried away through thechannel T on top of the hood by means of the exhausterU and transportedto the depositing-chamber. Thus a separation of the'fine from the coarseparticles is effected without the use of screens, sieves, or similarappliances. The course of the currents of material in the said apparatusis indicated by the arrows in the drawings.

I will now proceed to describe the improved driving apparatus shown inFigs. '7 and 8, wherein V is a suitable double-actin g steamengine onthe same bed-plate or foundation as the pulverizing-machine. C is a wormfixed upon the shaft (1 and having, preferably, six or more threads. Themotor is inclosed in a casing v, and the worm O and worm-wheel V areinclosed in a casin g 1 which forms an extension of the casingv, with aremovable top cover 22 and also a removable hood o which latter isprovided in order that easy access to the bearing thereunder may be had.The bearing V of the shaft V and the bearing 0 of the shaft 0 areprovided with caps having open tops, which will always be kept full ofand worm-wheel improves the construction of the apparatus, for thevertical walls thereof form good supports for the bearings 0 whichbridge the space between them and serve, in turn, to tie the said sidewalls together, so as to stiffen the structure. Part of the mainframing, as at W', is formed to serve as an oilbath for the worm-wheeland the motor.

In machinery of this kind arrangements for preventing dust from enteringthe bearings during the working of the machine are matters ofconsiderable importance, and Iaccordingly provide circular fliers orcupped Washers 0 upon the beater-shaft O, as in Fig. 2. The fliers areat'fixed to the shaft and cast off centrifugally any grit or dust thatmay issue from the reducing-chamber.

I provide water-jackets for the reducingchambers in certain cases andprovide the said jackets with proper circulators.

The pitch of the thread upon the worm 0*, as well as of the teeth of theworm-gear V, is such as to prevent the liability of these parts binding.

What I claim is 1. In a disintegrating-machine, the combination with areducing-chamber of a reliefchamber arranged on one side of saidreducing-chamber,its open top communicating with the upper part of itslower end with the interior of the reducing-chamber within thepechamber, a relief-chamber on one side of the reducing-chamber openinginto the separating-chamber, a baflie-plate arranged over the open topof the reducing-chamber and inclined away from the open top of thereliefchamber, a second bathe-plate over the top of the first andinclined to direct the current deflected by the latter back over theopen top of the relief-chamber, an air-exhausting apparatus and apassage to the same from the top of the separating-chamber,substantially as described.

In testimony whereof I have hereunto set my hand this 1st day ofDecember, 1897.

SIDNEY STRAKER.

Witnesses I II. A. SHLEY NORRIS,

. FRED C. HARRIS.

